During an experiment the students prepared three mixtures: A)Starch in water B) Sodium chloride solution C) Tincture of Iodine.

i) Students observed a visible beam of light through mixture A. Why?
ii) Tincture of Iodine did not show Tyndall effect. Explain reason.
iii) How can you relate particle size to the Tyndall effect?

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

Draw two cyclic constitutional isomers of cis-1

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions